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| author | Theodore Ts'o <tytso@mit.edu> | 2018-04-24 00:51:28 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-04-24 18:00:08 +0200 |
| commit | 6c1e851c4edc13a43adb3ea4044e3fc8f43ccf7d (patch) | |
| tree | 0762f3b03339b0ab30f3163ab0ac314b75f05d02 /drivers/char/random.c | |
| parent | random: add new ioctl RNDRESEEDCRNG (diff) | |
| download | linux-6c1e851c4edc13a43adb3ea4044e3fc8f43ccf7d.tar.xz linux-6c1e851c4edc13a43adb3ea4044e3fc8f43ccf7d.zip | |
random: fix possible sleeping allocation from irq context
We can do a sleeping allocation from an irq context when CONFIG_NUMA
is enabled. Fix this by initializing the NUMA crng instances in a
workqueue.
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot+9de458f6a5e713ee8c1a@syzkaller.appspotmail.com
Fixes: 8ef35c866f8862df ("random: set up the NUMA crng instances...")
Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'drivers/char/random.c')
| -rw-r--r-- | drivers/char/random.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/char/random.c b/drivers/char/random.c index 3cd3aae24d6d..721dca8db9cf 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -789,7 +789,7 @@ static void crng_initialize(struct crng_state *crng) } #ifdef CONFIG_NUMA -static void numa_crng_init(void) +static void do_numa_crng_init(struct work_struct *work) { int i; struct crng_state *crng; @@ -810,6 +810,13 @@ static void numa_crng_init(void) kfree(pool); } } + +static DECLARE_WORK(numa_crng_init_work, do_numa_crng_init); + +static void numa_crng_init(void) +{ + schedule_work(&numa_crng_init_work); +} #else static void numa_crng_init(void) {} #endif |